"A",
"B",
"C",
"D",
"E",
"F",
"G"/"H",
"I"/"J"/"K"/"L",
"M"/"N"/"O",
"P"/"Q",
"R",
"S",
"T",
"U"/"V"/"W"/"X"/"Y"/"Z"
Magnetic {H} Field: The field produced when current flows through a conductor or antenna.
Marconi antenna: A quarter-wave antenna oriented perpendicular to the earth and operated with
one end grounded.
Maximum usable frequency: The highest frequency for a given
elevation angle that will reflect from an ionospheric layer. Also
called MUF.
Megahertz: One million cycles per second. Also called MHz.
Modulate: To change the output of a transmitter in amplitude
phase, or frequency in accordance with the information to be transmitted.
Monopole antenna: An antenna with a single radiating element; a
whip antenna.
Multipath: The multiple paths a radio wave may follow between transmitter and receiver.
Node: The fixed minimum points of voltage or current on a standing wave or antenna.
Noise: Random pulses of electromagnetic energy generated by
lightning or electrical equipment.
Nutating: Moving an antenna feed point in a conical pattern so that the polarization of the beam does not change.
Offset angle: The angle at which a long wire antenna must be
aimed on either side of the direction to the base station.
Omnidirectional antenna: An antenna whose radiation pattern
shows equal radiation in all horizontal directions.
Oscillation: A periodic, repetitive motion or set of values (voltage,
current, velocity).
Out of phase: Two alternating quantities not passing through corresponding
values at the same time (e.g., if the current in a circuit
reaches its maximum value before or after the applied voltage does,
the current is out of phase with the voltage).
Antenna "P" and "Q" Terms
